Soil bacteria and fungi may be the key to unlocking a solution for childhood allergic disease. New research suggests that the unique blend of fungi and bacteria in a region's soil could be the strongest factor in explaining its rates of childhood allergic disease. The study, presented at AGU's 2025 Annual Meeting, found that certain assemblages of soil critters are linked with better health outcomes, and this pattern appears consistently across the globe.
The research team, led by microbial ecologist Joshua Ladau, analyzed data from over a million children in over 250 cities across 97 countries, along with soil samples from around the world. They found that soil microbes are the most important predictor of regional differences in allergic rhinitis and asthma, and are up to four times more predictive than other known factors like climate, wealth, and demographics.
But it's not just about the diversity of microbes. The specific types of microbes in the soil seem to matter more. Some microbial taxa promote health, while others are negatively associated with allergic disease. This discovery adds a new dimension to our understanding of soil biodiversity and its impact on public health.
Ladau's team is now working to investigate ways to promote public exposure to potentially healthful soils, such as encouraging people to spend more time outdoors and implementing policies and land management strategies aimed at conserving and restoring soils. The study also raises questions about the causative connection between soil microbes and allergic disease, and the team is eager to explore this further.
The research, titled 'Microbial Diversity in Soils Is the Top Predictor of Global Rates of Childhood Allergic Disease', will be presented on December 16, 2025, at AGU's Annual Meeting in New Orleans. The study highlights the importance of soil biodiversity in predicting allergic disease and provides a new perspective on the role of soil in public health.
